test: add comprehensive unit, integration, and e2e test suites

Introduce complete test coverage for the ARTEMIS platform across multiple layers:
Unit tests: Add tests for agent nodes (Planner, Operator, Validator, Diagnoser, FlashRunner, Explorer), tools, utils (OCR/XML fusion, UI hierarchy), and data engine.
Integration tests: Add live tool verification, reactive runner, IME, and standalone workflow tests.
E2E tests: Add end-to-end scenario tests for media playback and failure recovery flows.
Fixtures & mocks: Add mock inputs (audio, video, screenshot) and test utilities.

tests/tools/operator/test_operator_tools.py

@@ -0,0 +1,68 @@
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from langchain_core.tools import BaseTool
+from artemis.agents.operator.operator import OperatorNode
+import pytest
+
+
+@pytest.mark.asyncio
+async def test_operator_tools(artemis_context, mock_state):
+    """Test all tools exposed by the OperatorNode."""
+    node = OperatorNode(ctx=artemis_context)
+
+    click_tool = node._get_click_tool()
+    assert isinstance(click_tool, BaseTool)
+    res = click_tool.invoke({"target": 1, "times": 1, "delay_ms": 100})
+    assert res == "Action Recorded"
+
+    input_text_tool = node._get_input_text_tool()
+    assert isinstance(input_text_tool, BaseTool)
+    res = input_text_tool.invoke({"text": "hello", "target": 1, "clear_exist": True})
+    assert res == "Action Recorded"
+
+    swipe_tool = node._get_swipe_tool()
+    assert isinstance(swipe_tool, BaseTool)
+    res = swipe_tool.invoke({"gesture": "up"})
+    assert res == "Action Recorded"
+
+    press_key_tool = node._get_press_key_tool()
+    assert isinstance(press_key_tool, BaseTool)
+    res = press_key_tool.invoke({"key": "ENTER"})
+    assert res == "Action Recorded"
+
+    manage_app_tool = node._get_manage_app_tool()
+    assert isinstance(manage_app_tool, BaseTool)
+    res = manage_app_tool.invoke({"action": "launch", "app_name": "Settings"})
+    assert res == "Action Recorded"
+
+    wait_for_delay_tool = node._get_wait_for_delay_tool()
+    assert isinstance(wait_for_delay_tool, BaseTool)
+    res = wait_for_delay_tool.invoke({"time_in_ms": 1000})
+    assert res == "Action Recorded"
+
+    long_press_tool = node._get_long_press_tool()
+    assert isinstance(long_press_tool, BaseTool)
+    res = long_press_tool.invoke({"target": 1, "duration": 1000})
+    assert res == "Action Recorded"
+
+    wait_for_text_tool = node._get_wait_for_text_tool()
+    assert isinstance(wait_for_text_tool, BaseTool)
+    res = wait_for_text_tool.invoke({"text": "Success", "state": "visible", "timeout_ms": 5000})
+    assert res == "Action Recorded"
+
+    reply_tool = node._get_reply_to_checker_tool()
+    assert isinstance(reply_tool, BaseTool)
+    res = reply_tool.invoke({"reasoning": "This is a test reply."})
+    assert isinstance(res, str)